Method:
Dissolve yeast in warm water mixed with warm milk too, and a teaspoon of sugar (or malt).
Beat the egg with a fork and put it in the center of the sifted flour. Then pour over the mix of water / milk / yeast / sugar and knead.

After one hour, dust the counter with flour, and roll out the dough about 1/2 cm thick.
Take a cookie cutter or a mug of about 10 cm in diameter and use it to cut out circles from the dough.

Put them on parchment paper in 2 trays and cover them with a clean towel in warm place.

Let them rise again until the oven heats up.

Make the sauce by mixing the tomato puree, salt, sugar, oil and oregano.
After 15-20 minutes gently press into the center of each piece with a spoon, and pour some tomato sauce.
Bake the mini pizzas in the oven for 7 minutes, then remove them and top each one with a slice of mozzarella.

Put the tray back into the oven and bake for another 5 minutes, until the mozzarella melts.

You can make margherita (like above) or inferno, by topping with the dried tomatoes, red peppers and spicy sausage.